var createError = require('http-errors');
var express = require('express');
var path = require('path');
// 引入session模块
var session = require('express-session');

var compression = require('compression');


// 数据库连接
require(process.cwd() + '/models/connect');



// 处理文件上传
var formidableMiddleware = require('express-formidable');

// cookieParser 和express-formidable组件冲突 不可同时使用
// var cookieParser = require('cookie-parser');
var logger = require('morgan');


var app = express();


// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// 开启gzip压缩
app.use(compression());
app.use(logger('dev')); 
// app.use(express.json());
// app.use(express.urlencoded({ extended: false }));
// app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'public/dist')));

// 设置跨域和相应数据格式
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With , yourHeaderFeild');
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By",' 3.2.1');
		res.header("Set-Cookie",["SameSite=None","Secure=true"]);
    // res.header("Content-Type", "application/json;charset=utf-8");
    if (req.method == 'OPTIONS') res.send(200)
    /*让options请求快速返回*/ else next() 
})
app.disable('etag');


// 处理post参数
app.use(formidableMiddleware({
	// 文件上传目录
	uploadDir: path.join(__dirname, 'public', 'uploads'),
	// 最大上传文件为2M
	maxFileSize: 2 * 1024 * 1024,
	// 保留文件扩展名
	keepExtensions: true
}));


// 路由
var routers = require('./routes/index.js')(app); 

// require('./models/menu.js')

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
